Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe287a3849aac563…

MALICIOUS

PDF

44.4 KB Created: 2020-08-16 12:32:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 019d7abed7d08493a18780bbbc858282 SHA-1: 3bf9e0952c6ffdb3884662e3d77f1098e88eae79 SHA-256: fe287a3849aac5631526558121995d1ce13df5d9a376f0858038f024857e4be3
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of embedded links, many of which point to external websites. One critical heuristic identified a link to a known malicious redirector infrastructure at 'ttraff.ru', which is used to disguise the ultimate destination. The document body, though heavily obfuscated, contains text related to 'Avast antivirus' and the malicious URL, suggesting a lure to trick users into downloading malware or visiting a phishing site. The presence of numerous Shopify-hosted PDFs also indicates a link farm strategy to improve search engine ranking and visibility for malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ttraff.ru/pify?keyword=avast+antivirus+2018+for+windows+10
    • http://legokodo.usapl-ct.com/uploads/1/3/0/7/130738890/kakobakamazomo_naterut.pdf
    • http://files.surrenderinmotion.com/uploads/1/3/2/6/132681657/lozoxavuliboga.pdf
    • http://files.southernstaraccounting.com/uploads/1/3/1/4/131453267/df8ab3bbd10.pdf
    • https://cdn.shopify.com/s/files/1/0441/2804/3160/files/76370698934.pdf
    • https://cdn.shopify.com/s/files/1/0433/7188/8803/files/todadepo.pdf
    • https://cdn.shopify.com/s/files/1/0433/7985/1414/files/48461658765.pdf
    • https://cdn.shopify.com/s/files/1/0428/9714/6019/files/zojudiwijijaxu.pdf
    • https://cdn.shopify.com/s/files/1/0435/0119/1328/files/abb_abacus_manual.pdf
    • https://cdn.shopify.com/s/files/1/0432/8734/7364/files/27024511279.pdf
    • https://cdn.shopify.com/s/files/1/0431/6587/6390/files/16943921221.pdf
    • https://cdn.shopify.com/s/files/1/0429/8512/8095/files/bicarbonate_buffer_system_in_blood.pdf
    • https://cdn.shopify.com/s/files/1/0434/2556/2785/files/48815817919.pdf
    • https://cdn.shopify.com/s/files/1/0435/8638/8136/files/nozumubi.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006f83.bin
cf1f4871458ee36072428296a2205a3320429a5c9e03ece65626edb7495cc707		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F83 5528 bytes
font_01_sfnt_off00008278.bin
ebdba1e69dce2c2446e6cb8126b33abd5579c0407c7b1de1925a9434f9b3221a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8278 10192 bytes

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